package com.example.publice.intercept;

import java.io.IOException;
import java.io.Serializable;
import java.util.concurrent.TimeUnit;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.example.util.CurrentUser;
import com.example.util.RedisKeys;

/**
 * web拦截器
 * 
 * @author wangkai
 *
 * @date: 2019年6月6日 下午1:47:49
 */
public class AdminInterceptor extends HandlerInterceptorAdapter {

	@Autowired
	private RedisTemplate<Object, Object> redisTemplate;

	/*
	 * (non-Javadoc) 在业务处理器处理请求之前被调用。预处理，可以进行编码、安全控制等处理；
	 * 
	 * @see org.springframework.web.servlet.handler.HandlerInterceptorAdapter#
	 * preHandle(javax.servlet.http.HttpServletRequest,
	 * javax.servlet.http.HttpServletResponse, java.lang.Object)
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws IOException {
		Subject subject = CurrentUser.getSubject();
		Serializable token = subject.getSession().getId();
		String key = RedisKeys.getShiroSysUserTokenKey(token.toString());
		String account = (String) redisTemplate.opsForValue().get(key);
		if (StringUtils.isNotBlank(account)) {// 已登陆
			String userKey = RedisKeys.getShiroSysUserKey(account);
			String sId = (String) redisTemplate.opsForValue().get(userKey);
			if (sId.equals(token.toString())) {
				Long expire = redisTemplate.getExpire(key);
				// 过期时间小于20分钟的,更新token
				if (expire < 20 * 60) {
					redisTemplate.expire(key, 30, TimeUnit.MINUTES);
					redisTemplate.expire(userKey, 30, TimeUnit.MINUTES);
				}
			} else {
				redisTemplate.delete(key);
				response.sendRedirect("/shrio/logout");
				return false;
			}
		}else{
			redisTemplate.delete(key);
			response.sendRedirect("/shrio/logout");
			return false;
		}
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 在业务处理器处理请求执行完成后，生成视图之前执行。后处理（调用了Service并返回ModelAndView，但未进行页面渲染），
	 * 有机会修改ModelAndView；
	 * 
	 * @see org.springframework.web.servlet.handler.HandlerInterceptorAdapter#
	 * postHandle(javax.servlet.http.HttpServletRequest,
	 * javax.servlet.http.HttpServletResponse, java.lang.Object,
	 * org.springframework.web.servlet.ModelAndView)
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {

	}

	/*
	 * (non-Javadoc) 在DispatcherServlet完全处理完请求后被调用，可用于清理资源等。返回处理（已经渲染了页面），
	 * 可以根据ex是否为null判断是否发生了异常，进行日志记录；
	 * 
	 * @see org.springframework.web.servlet.handler.HandlerInterceptorAdapter#
	 * afterCompletion(javax.servlet.http.HttpServletRequest,
	 * javax.servlet.http.HttpServletResponse, java.lang.Object,
	 * java.lang.Exception)
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
	}

}
